United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for April 1, 2005

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Part 21 2005-0012 - Cutler-Hammer Freedom Series Model C306 Thermal Overload Relays

Licensee/Facility:

VOGTLE
FRAMATOME ANP

Dockets:

License No:
Notification:

MR Number: H-2005-0011
Date: 03/02/2005


Source Document: Letter

Reviewer: Vern Hodge

Discussion:

Part 21 2005-0012-00 - Cutler-Hammer Freedom Series Model C306 Thermal Overload Relays

Framatome ANP, a supplier of electrical products for nuclear power plants, reported tripping problems with Cutler-Hammer Freedom Series Model C306 Thermal Overload Relays and Heater Packs. At Vogtle, these components are used in some applications as containment penetration conductor primary protection. It is necessary in such applications that all three phases trip properly. During pre-installation testing of several thermal overload relays with different model heater packs, instances were found where single and multiple overload relay phases would trip either early, late, or not at all.

The licensee is continuing work with Framatome to evaluate the deviation to fully characterize the issue. They are currently reviewing the Vogtle pre-installation testing program for these components to determine if a manufacturing defect exists. This evaluation is expected to be completed by April 29, 2005.

Accession Numbers:

Accession No Accession Date
ML050630275 03/02/2005

Contacts:

Name Office Abbrev Phone No E-Mail
HODGE, VERNON NRR (301) 415-1861 CVH@nrc.gov
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